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Commit29e0146

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Manju080mroeschkepre-commit-ci[bot]rhshadrach
authored
BUG: Impossible creation of array with dtype=string (#61263)
* DOC: Update warning in Index.values docstring to clarify index modification issues (#60954)* DOC: Update warning in Index.values docstring to clarify index modification issues (#60954) with changes* Update pandas/core/indexes/base.pyCo-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>* DOC : Fixing the whitespace which was causing error* Fixed docstring validation and formatting issues* BUG: Fix array creation for string dtype with inconsistent list lengths (#61155)* BUG: Fix array creation for string dtype with inconsistent list lengths (#61155)* BUG fix GH#61155 v2* BUG fix GH#61155 with test case for list of lists handling* Fix formatting in test_string_array.py (pre-commit autofix)* [pre-commit.ci] auto fixes from pre-commit.com hooksfor more information, seehttps://pre-commit.ci* Add test for list of lists handling in ensure_string_array (GH#61155)* fixing checks* [pre-commit.ci] auto fixes from pre-commit.com hooksfor more information, seehttps://pre-commit.ci* Update pandas/tests/libs/test_lib.pyCo-authored-by: Richard Shadrach <45562402+rhshadrach@users.noreply.github.com>* Remove pandas/tests/arrays/test_string_array.py as requested* wrong fiel base.py* Remove check for nested lists in scalars in string_.py first try* Revert unintended changes to base.py---------Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>Co-authored-by: Richard Shadrach <45562402+rhshadrach@users.noreply.github.com>
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‎pandas/_libs/lib.pyx

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@@ -777,7 +777,10 @@ cpdef ndarray[object] ensure_string_array(
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return out
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arr= arr.to_numpy(dtype=object)
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elifnot util.is_array(arr):
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arr= np.array(arr,dtype="object")
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# GH#61155: Guarantee a 1-d result when array is a list of lists
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input_arr= arr
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arr= np.empty(len(arr),dtype="object")
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arr[:]= input_arr
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result= np.asarray(arr,dtype="object")
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‎pandas/tests/libs/test_lib.py

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@@ -297,3 +297,13 @@ def test_ensure_string_array_copy():
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assertnotnp.shares_memory(arr,result)
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assertarr[1]isNone
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assertresult[1]isnp.nan
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deftest_ensure_string_array_list_of_lists():
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# GH#61155: ensure list of lists doesn't get converted to string
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arr= [list("test"),list("word")]
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result=lib.ensure_string_array(arr)
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# Each item in result should still be a list, not a stringified version
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expected=np.array(["['t', 'e', 's', 't']","['w', 'o', 'r', 'd']"],dtype=object)
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tm.assert_numpy_array_equal(result,expected)

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